Here are a few more marines.
This guy is a very old model, glimpsed in the last post, and probably from the Rogue Trader/Blue Catalogue time. He's holding a tiny hand flamer and a plasma gun, and has that odd bent-legged "going to the toilet" pose that was quite common back then. The detail is quite soft and simple, with the result that there's a lot of space to add freehand (which I've not added) and shading.
The last chap (assuming he is a chap - it's hard to tell under all that armour) is a plastic model, using the upper body of an old captain, the head of a Grey Knight and arms and an axe from the Space Wolves, that happened to be in the bits box. I could have been a bit sharper on the paint job but I like the way the bits go together. Sometimes it's fun to just sit down a make a random bloke.